John D. and Adolph Spreckels donated the Spreckels Organ, to the City of San Diego in 1914 for the Panama-California Exposition. This unique organ contains more than 5,000 pipes ranging in length from the size of a pencil to 32 feet and is the largest outdoor pipe organ in the world. The Spreckels Organ is housed in an ornate vaulted structure with highly embellished gables. Since 1917, San Diego has had a civic organist, who performs free weekly Sunday concerts.